1398201660 has 36 divisors (see below), whose sum is σ = 4241212248. Its totient is φ = 372853728.

The previous prime is 1398201617. The next prime is 1398201683. The reversal of 1398201660 is 661028931.

1398201660 is a `hidden beast` number, since 1 + 398 + 201 + 6 + 60 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3883714 + ... + 3884073.

Almost surely, 2^1398201660 is an apocalyptic number.

1398201660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1398201660 is an abundant number, since it is smaller than the sum of its proper divisors (2843010588).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1398201660 is a wasteful number, since it uses less digits than its factorization.

1398201660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7767802 (or 7767797 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 1398201660 is about 37392.5348164577. The cubic root of 1398201660 is about 1118.2097408707.

The spelling of 1398201660 in words is "one billion, three hundred ninety-eight million, two hundred one thousand, six hundred sixty".